Audi A3 Sportback (2018) is 37 mm (1.46 inch) higher and 557 kg (1,228 lbs) lighter than BMW 4 Series Gran Coupe (2017).
BMW 4 Series Gran Coupe (2017) is 325 mm (12.80 inch) longer, 41 mm (1.61 inch) wider and has 101 liters (3.57 ft3) bigger cargo space than Audi A3 Sportback (2018).
